#div0 {
    width: 80%;
    margin-left: 10%;
}

#div_top {
    width: 100%;
}

#div_left {
    width: 20%;
}

#div_main {
    width: 80%;
}

#div_bottom {
    background-color: #FFCCCC;
    width: 80%;
    margin-left: 20%;
    border: 0px solid blue;
}

iframe {
    width: 100%;
    float: left;
    border: 0px solid red;
}